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behavior, depending on how the tool is exited (For instance, in the Microsoft Windows environment, it is common to be able to terminate a program either by selecting the File | Exit options from a menu on the top left of the window, or by clicking an X in the top-right corner The programmers who wrote the tool may well have coded different logic into these functions) In either case, it will be a controlled exit, so the programmers should issue either a COMMIT or a ROLLBACK, but the choice is up to them If a client s session fails for some reason, the database will always roll back the transaction Such failure could be for a number of reasons: the user process can die or be killed at the operating system level, the network connection to the database server may go down, or the machine where the client tool is running can crash In any of these cases, there is no orderly issue of a COMMIT or ROLLBACK statement, and it is up to the database to detect what has happened The behavior is that the session is killed, and an active transaction is rolled back The behavior is the same if the failure is on the server side If the database server crashes for any reason, when it next starts up all transactions from any sessions that were in progress will be rolled back

Oracle s implementation of the relational database paradigm begins a transaction implicitly with the first DML statement The transaction continues until a COMMIT or ROLLBACK statement The SAVEPOINT command is not part of the SQL standard and is really just an easy way for programmers to back out some statements, in reverse order It need not be considered separately, as it does not terminate a transaction

Commit processing is where many people (and even some experienced DBAs) show an incomplete, or indeed completely inaccurate, understanding of the Oracle architecture When you say COMMIT, all that happens physically is that LGWR flushes the log buffer to disk DBWn does absolutely nothing This is one of the most important performance features of the Oracle database EXAM TIP What does DBWn do when you issue a COMMIT command Answer: absolutely nothing To make a transaction durable, all that is necessary is that the changes that make up the transaction are on disk: there is no need whatsoever for the actual table data to be on disk, in the datafiles If the changes are on disk, in the form of multiplexed redo log files, then in the event of damage to the database the transaction can be reinstantiated by restoring the datafiles from a backup taken before the damage occurred and applying the changes from the logs This process is covered in detail in later chapters for now, just hang on to the fact that a COMMIT involves nothing more than flushing the log buffer to disk, and flagging the transaction as complete This is why a transaction involving millions of updates in thousands of files over many minutes or hours can

When you begin your work in Photoshop, usually you will have document dimensions already established (85 11 inches) You can set up your Photoshop document with these dimensions or estimate the approximate size of the graphic space you will be using within the document layout (for example, 3 5 inches) If you do not know how big to build your graphic, always build it larger than you need it You can always reduce the size without losing digital quality However, if you have built the file too small, the image will become pixelated and fuzzy if you attempt to increase the image dimensions

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be committed in a fraction of a second Because LGWR writes in very nearly real time, virtually all the transaction s changes are on disk already When you say COMMIT, LGWR actually does write in real time: your session will hang until the write is complete This delay will be the length of time it takes to flush the last bit of redo from the log buffer to disk, which will take milliseconds Your session is then free to continue, and from then on all other sessions will no longer be redirected to the undo blocks when they address the changed table, unless the principle of consistency requires it The change vectors written to the redo log are all the change vectors: those applied to data blocks (tables and indexes) and those applied to undo segments EXAM TIP The redo log stream includes all changes: those applied to data segments and to undo segments, for both committed and uncommitted transactions Where there is often confusion is that the stream of redo written out to the log files by LGWR will contain changes for both committed and uncommitted transactions Furthermore, at any given moment DBWn may or may not have written out changed blocks of data segments or undo segments to the datafiles for both committed and uncommitted transactions So in principle, your database on disk is corrupted: the datafiles may well be storing uncommitted work, and be missing committed changes But in the event of a crash, the stream of redo on disk always has enough information to reinstantiate any committed transactions that are not in the datafiles (by use of the changes applied to data blocks), and to reinstantiate the undo segments (by use of the changes applied to undo blocks) needed to roll back any uncommitted transactions that are in the datafiles EXAM TIP Any DDL command, or a GRANT or REVOKE, will commit the current transaction.